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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52caae3fb4a343107046fbadc99058c81ed8b801a2c824995c2f3714ecb79464' 
  AND token = 'sOQ+yEDL+hH2yBR/4byMT/Q6xtbk47Nf2Joii6z3STU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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