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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b0713507edb4163de739798a8aa0a13f29e0e7bf4fbd19df1a5e8282a526a07' 
  AND token = '1SfVNtwEx2RjbS75dqwesEqMpuBdqUhjkRDFjF5z5Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}