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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a02d10fd9633ac4cbbf7dfda77591c9feb9b5ed475c5a58291c61089a74ca6ff' 
  AND token = 'P1cTdvtspHR/0ARnOKW9BoPfVyTduNimyW5buN5vbLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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