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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bb4b88510b1acd56b8c334b424c89bb108f83f7d8315b0835e68196f16b48d3' 
  AND token = 'LpjloJPNDnYFAk75I8ENEt4l3/HJ90EEm/QZ26NpWSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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