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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4763f681b541f971307757b35dac90fab2be5e4d476401a3988008aba7b07542' 
  AND token = 'buRBMae/FDfuVAduIPEMdQT3+1+hOW1NMGCRsxkW9Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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